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  <title>Prepare an SQL-statement for execution</title>
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  <div id="layout-content"><div id="function.ifx-prepare" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">ifx_prepare</h1>
  <p class="verinfo">(PHP 4, PHP 5 &lt; 5.2.1)</p><p class="refpurpose"><span class="refname">ifx_prepare</span> &mdash; <span class="dc-title">Prepare an SQL-statement for execution</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.ifx-prepare-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>ifx_prepare</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$query</code></span>
   , <span class="methodparam"><span class="type">resource</span> <code class="parameter">$link_identifier</code></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$cursor_def</code></span>
   ], <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$blobidarray</code></span>
   ) : <span class="type">resource</span></div>

  <p class="para rdfs-comment">
   Prepares a <code class="parameter">query</code> for later use with
   <span class="function"><a href="ifx_do.html" class="function">ifx_do()</a></span>.
  </p>
  <p class="para">
   For &quot;select-type&quot; queries a cursor is declared and opened.
   Non-select queries are &quot;execute immediate&quot;.
  </p>
  <p class="para">
   For either query type the number of (estimated or real) affected rows is
   saved for retrieval by <span class="function"><a href="ifx_affected_rows.html" class="function">ifx_affected_rows()</a></span>.
  </p>
  <p class="para">
   If the contents of the TEXT (or BYTE) column allow it, you can also use
   <em>ifx_textasvarchar(1)</em> and 
   <em>ifx_byteasvarchar(1)</em>.  This allows you to treat TEXT
   (or BYTE) columns just as if they were ordinary (but long) VARCHAR columns
   for select queries, and you don&#039;t need to bother with blob id&#039;s.
  </p>
  <p class="para">
   With <em>ifx_textasvarchar(0)</em> or 
   <em>ifx_byteasvarchar(0)</em> (the default situation), select
   queries will return BLOB columns as blob id&#039;s (integer value).  You can
   get the value of the blob as a string or file with the blob functions (see
   below).
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.ifx-prepare-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">query</code></dt>

     <dd>

      <p class="para">
       The query string.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">link_identifier</code></dt>

     <dd>

      <p class="para">
       The link identifier.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">cursor_def</code></dt>

     <dd>

      <p class="para">
       This optional parameter allows you to make this a 
       <em>scroll</em> and/or <em>hold</em> cursor.
       It&#039;s a bitmask and can be either <strong><code>IFX_SCROLL</code></strong>,
       <strong><code>IFX_HOLD</code></strong>, or both or&#039;ed together.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">blobidarray</code></dt>

     <dd>

      <p class="para">
       If you have BLOB (BYTE or TEXT) columns in the query, you can add
       a <code class="parameter">blobidarray</code> parameter containing the
       corresponding &quot;blob ids&quot;, and you should replace those columns
       with a &quot;?&quot; in the query text.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.ifx-prepare-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns a valid result identifier for use by <span class="function"><a href="ifx_do.html" class="function">ifx_do()</a></span>,
   or <strong><code>FALSE</code></strong> on errors.
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.ifx-prepare-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="ifx_do.html" class="function" rel="rdfs-seeAlso">ifx_do()</a> - Execute a previously prepared SQL-statement</span></li>
   </ul>
  </p>
 </div>


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